Logan Steele
The human body has over 600 muscles, which help us do everything from breathing to lifting heavy weights. Muscles are made up of thousands of small elastic fibres that contract and relax to cause movement. They work together with bones, tendons, and ligaments to support our weight and move us. Skeletal muscles are attached to bones via tendons and are controlled voluntarily. Smooth muscles, on the other hand, are involuntary and help with digestion and vision. Cardiac muscles, found only in the heart, are also involuntary and pump blood throughout the body. To keep muscles healthy, it's important to exercise, rest, and eat a balanced diet with sufficient protein and nutrients like calcium, magnesium, and potassium.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600 |
| Function | Movement, breathing, digestion, pumping blood, giving birth, etc. |
| Types | Skeletal, smooth, cardiac, visceral |
| Skeletal muscle shapes | Spindle, flat, etc. |
| Skeletal muscle functions | Control tendons, ligaments, and bones, keep body balanced, etc. |
| Smooth muscle functions | Keep body healthy, help focus eyes, move food through the body, etc. |
| Cardiac muscle function | Pump blood through the body |
| Visceral muscle function | Contract to move substances through organs |
| Muscle injuries | Strain, tear, tendinitis, etc. |
| Muscle recovery | RICE method, rest, etc. |
| Muscle health | Exercise, balanced diet, etc. |
| Muscle-building foods | High protein, low saturated fat, chicken breasts, Greek yogurt, beans, etc. |
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What You'll Learn
Types of muscles: Skeletal, smooth, cardiac, and visceral
The human body has more than 600 muscles that help us move, breathe and stay alive. There are three major types of muscle tissue: skeletal, smooth, and cardiac. Each type has unique cellular components, physiology, specific functions, and pathology.
Skeletal muscles are voluntary muscles that move when you consciously decide to move a part of your body. They are attached to the skeleton and are responsible for controlling movement and posture. Some skeletal muscles contract quickly and use short bursts of energy (fast-twitch muscles), while others move more slowly, like the back muscles that help with posture. They are striated in appearance, meaning they have a striped appearance due to the arrangement of actin and myosin into regular myofibrils. Skeletal muscle tissue is the only muscle tissue under the direct conscious control of the cerebral cortex of the brain, giving it the designation of being voluntary muscle.
Cardiac muscle, or myocardium, is an involuntary, striated muscle that encloses the chambers of the heart. It is made of individual cardiomyocytes, which are similar in structure to skeletal muscle cells. Cardiac muscle cells are shorter than skeletal muscle cells and form a network of many branches between the cells. They are located in the walls of the heart and appear striped (striated). Cardiac muscle is responsible for pumping blood through the cardiovascular system, leading to proper oxygenation and maintenance of each cell in the human body.
Smooth muscle is an involuntary muscle that lines the inside of some organs. They are located in the walls of many organs and are present throughout the gastrointestinal, reproductive, urinary, vascular, and respiratory systems. Smooth muscles do essential jobs like moving waste through the intestines and helping the lungs expand when breathing. Smooth muscle cells are not striated, meaning they lack the striped appearance of skeletal and cardiac muscles due to the absence of sarcomeres. They are composed of actin and myosin fibres arranged in sheets rather than spindles, giving them a smooth appearance.
Visceral muscle is another term for smooth muscle due to their structural similarities. Visceral muscles are found in the organs, blood vessels, and bronchioles of the body, and they move substances throughout the body.
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Muscle movement: Voluntary and involuntary
The human body has over 600 muscles that help us move, breathe, swallow and stay alive. There are three types of muscle: skeletal, smooth, and cardiac. Skeletal muscles are voluntary, while smooth and cardiac muscles are involuntary.
Voluntary muscles are those under conscious control. They include the skeletal muscles that attach to bones, such as the muscles in our arms, legs, neck, back, and trunk. We can choose to move these muscles, such as when we decide to sprint or flick a thumb. Weakness or an inability to control voluntary skeletal muscles can signal a health issue, such as a neuromuscular disorder or electrolyte imbalance.
Involuntary muscles, on the other hand, are those that move automatically without conscious thought. They include the smooth muscles found inside organs like the blood vessels, stomach, intestines, uterus, and heart. These muscles help with essential bodily functions, such as moving waste through the intestines, helping the lungs expand during breathing, and playing a role in the female and male reproductive systems.
The cardiac muscle, or myocardium, is another type of involuntary muscle. It is found only in the heart and is responsible for pumping blood throughout the body. The cardiac muscle contracts automatically and rhythmically, controlled by both the autonomic nervous system and its own pacemaker cells.
While most muscles are either voluntary or involuntary, it is important to note that some functions in our body, such as breathing, speaking, and swallowing, involve a combination of both types of muscles working together.
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Muscle injuries: Strains, tears, and tendon injuries
Muscle strains, or pulled muscles, are common injuries that can be very painful. They occur when a muscle or tendon is stretched too far or contracts too strongly, causing the muscle fibres to tear. This can happen suddenly, for example during sports or exercise, or gradually through repetitive movements over time. Tendons, the tissues that connect muscles to bones, can also be injured through repetitive or intense motions, causing tendinitis.
Strains and tendon injuries can cause pain, swelling, bruising, weakness, and muscle spasms. The pain can range from mild to severe, depending on the extent of the strain. If you have pulled a muscle, you will probably know how it happened, and symptoms may include visible bruising and swelling.
Most muscle strains can be treated at home with the RICE method: Rest, Ice, Compression, and Elevation. For rest, avoid the activity that caused the injury and try not to use the injured body part while it heals. Apply ice a few times a day for 15 minutes at a time, wrapping ice packs in a towel so they are not directly on your skin. Wrap an elastic bandage around the injured muscle to help reduce swelling, and keep the injured muscle elevated above the level of your heart as often as possible.
In some cases, however, muscle strains may need medical care or even surgery. If you think you have a severe strain or tendon injury, you should see a doctor to prevent further harm and determine the appropriate treatment.
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Muscle health: Nutrition, exercise, and rest
Our bodies contain more than 600 muscles that help us move, breathe, and perform several other vital functions. Maintaining muscle health is essential for overall well-being and can be achieved through proper nutrition, targeted exercises, and adequate rest.
Nutrition
Nutrition plays a crucial role in muscle health. Malnutrition and poor dietary intake can lead to adverse outcomes, including reduced physical performance, decreased muscle mass and strength, and increased frailty in older adults. To promote healthy muscles, it is important to consume a balanced and nutritious diet.
Protein intake is particularly important for muscle health. Current guidelines recommend that adult males and females consume 56 grams and 46 grams of protein daily, respectively. Consuming protein during or immediately after exercise can stimulate muscle protein synthesis and promote effective muscle recovery.
In addition to protein, other nutrients like leucine-enriched protein, calcium, and vitamin D have been shown to improve muscle mass in older adults. A dietary pattern that includes white rice, fish, and seaweeds has also been associated with a lower prevalence of low muscle mass.
Exercise
Cardiovascular exercise, also known as cardio or aerobic activity, is vital for overall health and can support muscle growth and function. Current guidelines recommend that adults engage in at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity physical activity each week.
Specific exercises such as lifting weights, squats, crunches, and push-ups can help build muscle strength and endurance. It is important to consult a doctor or a personal trainer before starting a new exercise regimen to ensure safety and avoid potential injuries.
Rest
Rest and recovery are integral components of muscle health and growth. When muscles undergo strenuous activity, they sustain microscopic damage known as microtears. Rest days allow these microtears to repair and rebuild, leading to stronger and more resilient muscles. Insufficient rest can reduce the ability to repair, slow fitness progression, and increase the risk of injury.
Creating a routine with dedicated rest days can help prevent over-fatiguing the muscles and the central nervous system, reducing performance and increasing the potential for injury. Rest days can also include light activities that promote recovery, such as stretching and elevation, which help reduce muscle soreness and improve flexibility.
In conclusion, maintaining muscle health involves a holistic approach that combines proper nutrition, targeted exercises, and adequate rest. By prioritizing these aspects, individuals can promote healthy muscles and overall well-being.
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Muscle disorders: Myopathy, weakness, pain, and paralysis
Myopathy is a general term for diseases that affect muscle fibres, causing muscle weakness. Myopathies are a heterogeneous group of disorders that primarily affect the skeletal muscle structure, metabolism, or channel function. They are usually characterised by muscle weakness, pain, and stiffness that interfere with daily life activities.
There are two types of myopathies: acquired and inherited. Inherited myopathies are rare, while acquired myopathies develop later in life and can be caused by other medical disorders, infections, medications, or electrolyte imbalances. Mitochondrial myopathy, a type of inherited myopathy, is caused by a defect in the mitochondria, the energy-producing part of the cells. It affects skeletal muscle and other organ systems like the heart, brain, and gastrointestinal tract.
Myopathies can also be classified as genetic or endocrine. Genetic myopathies can be passed from parent to child and may present at birth with severe impairments in swallowing and speech abilities, developmental motor delays, and facial or skeletal abnormalities. Endocrine myopathies occur when hormones interfere with muscle function. Patients with autoimmune disorders, metabolic disorders, or endocrine disorders are at an increased risk of developing acquired myopathy.
Muscle weakness, cramps, stiffness, and spasms are common symptoms of myopathies. These symptoms can affect the upper arms, shoulders, hips, and thighs, leading to difficulties in performing daily activities such as bathing, dressing, or climbing stairs. Some myopathies are associated with rhabdomyolysis, a muscle fibre condition. Toxic myopathy is another form of myopathy caused by toxins or medications that interfere with muscle structure or function. Alcohol, toluene (found in spray paint), and certain medications like corticosteroids and statins can lead to toxic myopathy.
In addition to myopathies, other muscle disorders include muscle strains, tendinitis, and paralysis. Muscle strains occur when a muscle or tendon is stretched too far or tears, resulting in pain, swelling, and bruising. Tendinitis is caused by repetitive or intense motions that injure the tendon, leading to pain and swelling. Paralysis refers to a loss of muscle function, often due to nerve damage or disruption in the signalling between the nerves and muscles. It can result in an inability to move certain parts of the body voluntarily.
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Frequently asked questions
There are three main types of muscles: skeletal, smooth, and cardiac. Skeletal muscles are voluntary muscles that help with movement, balance, and posture. Smooth muscles are involuntary and are located within various internal structures, including the digestive tract, uterus, and blood vessels. Cardiac muscle is specific to the heart and is also involuntary.
Building muscle requires a well-balanced diet that includes foods high in protein and low in saturated fat, as well as healthy carbohydrates and fats. Some examples of muscle-building foods include chicken breasts, Greek yogurt, turkey breast, seafood like tilapia, and beans.
To prevent muscle injuries, it is important to stretch, warm up before exercise, and increase overall flexibility. If you experience a muscle strain or injury, you can use the RICE method: Rest, Ice, Compression, and Elevation. Rest involves avoiding the activity that caused the injury and giving the injured muscle time to heal. For icing, apply a cold compress for 15 minutes at a time, wrapped in a towel to avoid direct contact with the skin. Compression involves wrapping an elastic bandage around the injured muscle to reduce swelling. Finally, keep the injured muscle elevated above the level of your heart whenever possible.
